Safety device for elevators



Q (No Model.) 2 Sheets-She'et 1.

P. T. ELLITHORPE. SAFETY DEVICE FUR ELEVATORS.

No. 527,171. Patented 00119, 1894.

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Patented on. 9, 1894.

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' "UNITE STATES PATENT OFFICE.

FREDERICK T. ELLITHORPE, OF NEWARK, NEW JERSEY.

SAFETY DEVICE F'oR ELEVATORS.

SPEUIFIGATION formingpart of Letters PatentNo. 527,171, dated October 9,1894.

Application filed July 3, 1894. $arial No.616,459. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK T. ELLI- THORPE, a citizen of the UnitedStates, residing at Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in SafetyDevices for Elevators; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, a

My invention relates to improvements in safety devices for elevators,and it has for one of its objects to provide means whereby safetydevices, such for instance asthose disclosed in the Letters Patent of A.O. Ellithorpe, No. 376,374, may be controlled and operated by theelevator conductor, so as to enable him to brake or stop the car when ithas gained a dangerous momentum or for any other reason, and thiswithout in any manner interfering with the automatic action of thedevices incident to the breaking of the hoisting rope or cable, orrunning away of the car. v v

Another object of the invention is to provide means whereby the elevatorconductor,

without leaving the car, may quickly and conveniently release the safetydevices or brakes and return the several parts to their normal position,so as to permit of the car beinglowered when it has been stopped betweenfloors by the safety devices.

Other objects and ad vantages of the invention will be fullyunderstood'from the following description and claims when taken inconnection with the annexed drawings,in which Figure 1, is a frontelevation of an elevator equipped with my improvements; the severalparts being shown in the position which they assume when the safetydeviceshave been set to stop the car. Fig. 2, is an enlarged, detailelevation illustrating the keeper for holding the rope or cable whichtakes over the governor pulley. Fig. 3, is a detail, plan view of suchkeeper, and Fig. 4, is a detail section illustrating one pair ofgripping devices and a portion of the mechanism for adjusting the same.-

Referring byletter to said drawings :%-'-A, indicates the ordinarystandards or uprights of any elevator which are provided with tracksvided with a transverse beam 0, but which otherwise may be of theordinary or any approved construction. The'said beam 0, of the carserves for the connection of the hoisting cable'b, and also servestosupport the as a, and B, indicates the car which is pro- These outerends of the links F, are connected with the inner ends of grippinglevers G, by pivotal links h, and the said levers G, have their fulcrumsat t, in boxings H, carried' by the beam 0, whereby it will be seen thatwhen the shaft D, is rotated in one direction, the gripping levers willbe caused to positively and securely engage the tracks a, and arrest thecarfrom descending, while when said shaft is rotated in the otherdirection, the gripping ends of said lovers will be moved out ofengagement with the tracks a.

The shaft D, is provided as shown in Fig. 1, with'a drum 1, which'iskeyed or otherwise fixed thereon, and on this drum is wound a cable asJ, which is designed to take over or 1 tarding device. In the saidLetters Patent all I of the construction thus far described isdisclosed,'and a cable O, similar to the cable J, of the presentapplication, is shown as connected by a hooked link with a keeper springon the car; the said keeper spring being designed to normally hold thecable 0, and being also designed to release the I cable when themovement of the same is retarded by the governor sheave so as to enablethe cable to rotate the shaft D, and force the gripping levers,G,against the tracks ato stop the car.

The construction disclosed in the present application operatesautomatically in a manner similar to that disclosed in the Patent N o. r

For such purpose I provide arope orchain K,

which takes around sheaves k, on the car and is connect'edatone end'withthe cable J, and has a weight L, at its opposite end, and a keeper Mcomprising two members M, N, which are arranged on the car and aredesigned to engage a ring P, or other suitable device carried by therope or chain K.

The keeper member M, preferably comprises a spring plate Z, which issecured by clips on a bracket m, connected to the beam 0, and a head or,which is of a peculiar con struction and hasthe beveled and bifurcatedportion 1), and the curved upper portion g, which is provided with theinclined grooves '1", (see Fig. 3,) designed and adapted to guide thering P, and prevent the same from being caught by the branches of thebifurcated portion 19. The keeper member N, is fulcrumed in suitablebearings in the bracket m, as shown at s, and it preferably has thelower weighted portion 25, and the upper beveled portion it. Said memberN, has its lower weighted end if, connected by a rope or chain 1), witha weight Q, and it is normally held by such weight against the member M,as shown in Fig. 2, so as to enable it in conjunction with such memberM, to normally retain the ring P, and thereby hold the cable J, andprevent the same from rotating the shaft D.

The weight Q, is arranged in asuitable casing as w,in the car and it isprovided with one or more lateral branches m, which extend through slotsin the casing and are designed to enable the elevator conductor toconveniently lift the weight with his hand or foot. When the weight Q,is so lifted, it will be seen that the lower, heavy end of the keepermember N, will swing in the direction indicated by arrow (see Fig. 2.)and will effect the release of the ring P, on the rope or chain K, so

as to permit the cable J,to wind off of the drum I, and rotate the shaftD, and set the grippinglevers against the tracks and thereby graduallystop the car.

In order that the safety devices may be conveniently released so as topermit of the car being raised or lowered to a floor, after it has beenstopped by the action of the safety devices, I provide the drum S, onthe shaft D, and the rope or chain T, which is wound upon said drum S,and takes around sheaves as g on the car and is wound upon a drumarranged in the car as shown. This latter drum U, has a handle as 2';and by the provision of the same together with the rope T, and drum S,it will be seen that when the parts have effected a setting of thegripping devices to stop the car and it is desired to bring the partsback to their normal positions to release the gripping devices, theoperator may without leaving the platform of the car,

rotate the shaft D, in the direction indicated by arrow so as to windthe cable J, (which is wound in a direction opposite to the rope T,)upon the drum 1. As the cabled, is wound upon the drum I, the grippinglevers G, will be moved away from the tracks a, and the rope K, byreason of the weight L, will be held tautand'drawn downwardly so as toenable the ring P, to engage the beveled portion to, of the keepermember N, and be guided under said keeper member N, and the keepermember M, to the position shown in Fig. 2. It is necessary however, whenthe ring P reaches the keeper member N, for the operator to lift theweight Q, so as to enable the ring P, to push the upper portion of thekeeper N, away from the keeper M, and pass to the position shown in Fig.2.

As before described the cable I, is designed to take over or around agovernor sheave such as disclosed in the aforesaid Letters Patent or beconnected to some equivalentretarding device and the ring P, is designedto be engaged and normally held by the keeper M", as better shown inFig. 2. Consequently it will be seen that when the hoisting cable breaksor the car runs away and the movement of the cable J, is retarded by thegovernor sheave or similar device, the weights 'L. and Q, will beovercome and the ring P,

will be pulled out of engagement with the keeper, when the shaft D, willbe rotated and the gripping levers G, forced against the tracks a, tostop the car.

The manualoperation of the devices isjust as simple and reliable as theautomatic operation, it being simply necessary when the car has gained adangerous momentum or when any of the machinery has broken or when thecar gets beyond the control of the operator, for him to raise the weightL, so as to permit the keeper member N, to swing away from the keepermember M, and release the ring P, as before described.

I have specifically described the construction and relative arrangementof the parts of my invention in order to imparta full, clear, and exactunderstanding of the same, but I do not desire to be understood asconfining myself to such construction and arrangement of parts as suchchanges or modifications may be made in practice as fairly fall withinthe scope of the invention. Ifurthermore do not desire to be understoodas confining myself to the application of my invention to the safetydevices disclosed by the Letters Patent No. 376,374, as they may beemployed in conjunction with any safety device to which they areapplicable.

I have described the safety devices comprising the shaft D, 850., asbeing preferably arranged on the beam G, at the top of the car. I do notdesire however to be understood as confining myself to this arrangementof the safety devices as they might be placed on the bottom or othersuitable part of a car and yet be operated automatically and manually inthe manner described. 1

Having described my invention, what I claim isi 1. In an elevator, thecombination'of acar, standards or guides therefor, a rotary shaftcarried by the cara drum S on said shaft,

i substantially as specified.

devices adapted to be forced into engagement with the standards orguides by the rotation of the shaft in one direction, a drum arranged inthe car, and a rope or chain connecting said drum inthe car and the drumon the rotary shaft, substantially as and for the purpose set forth.

2. In an elevator, the combination of'a car, arotary'shaft carried bythe car a .drum I on said shaft, a cable wound on the drum I of therotary shaft, a keeper mounted on the car, a connection intermediate ofthevcable and the keeper, and devices under the control of the elevatorconductor connected With and adapted to normally retain the keeper inengagement with the connection intermediate of the same and the cable,substantially as and for the purpose set forth.

3. In an elevator the combination of a car, a rotary shaft carried bythe car a drum I, on said shaft, a cable wound on the drum I of therotary shaft, a keeper mounted on the car, a connection intermediate ofthe cable and the keeper, and a Weight connected with the keeper andadapted to normally retain the keeper in engagement with the connectionintermediate of the sameand the cable;

said weight being so arranged that it may be raised by the elevatorconductor to release the connection from the keeper, substantially asspecified.

4. In an elevator, the combination of a car, a rotary shaft carried bythe car drums I, S,

on said shaft a drum arranged in the car, a

rope or chain connecting said drum in the car and the drum S, so thattheshaft may be rotated in one direction by a person within the car, acable J, Wound on the drum I, of

the rotary shaft, a'keeper mounted on the car, a connection intermediateof the cable and the keeper and devices under the control of theelevator conductor connected with and adapted to normally retain thekeeper in engagement with the connection intermediate of the same andthe cable, substantially as specified.

5. In an elevator, the combination of acar, a rotary shaft carried bythe car drums I. S. on said shaft a drum arranged in the car, a

rope or chain connecting said drum inthe car and the drum S, so that theshaft may be rotated in one direction by a person within a car, a cableJ, wound on the drum I, of the rotary shaft, a keeper mounted on thecar, a weight as L, and rope or chain connecting the weight L, and thecable and adapted to be engaged and normally retained by the keeper,

6. In an elevator, the combination of a car, a rotary shaft carried bythe car drums I, S, on said shaft a drum arranged in the car andconnected by a rope or chain with the drum S, a cable J, wound on thedrum I, of the rotary shaft, a keeper mounted on the car, a

weight L, a rope or chain connecting the weight L, and the cable andadapted to be engaged by the keeper, and a weight Q, connected with. thekeeper and adapted to normally retain it in engagement with the rope orchain between ,the cable and the weight L; said weight Q, being soarranged in the car as to be under the control of the conductor,substantially as specified.

7. In an elevator the combination of a car, a rotary shaft carried bythe car a drum I, on said shaft a cable J, wound on the drum I, a weightas L, a rope or chain connecting the weight and the cable, and providedwith a ring, a keeper member M, carried by the car and comprising aspring plate and a head having the upper grooved-portion and the lowerbeveled portion,a pivoted keeper member N, arranged adjacent to thekeeper member M, and having its lower portion weighted and its upperportion beveled orinclined, and I said shaft a keeper member M, carriedby the car and comprising a spring plate and a head having the uppergrooved portion and the lower beveled portion,a pivoted keeper member N,arranged adjacent to the keeper mem- .ber M, and having its lowerportion weighted and its upper portion beveled or inclined, a

suitable means for normally holding the member N, against the member M,acable J, wound upon the drum I, and a cord or chain connected to saidcable and carrying a device adapted to be engaged and normally retainedby the keeper members M, N, substantially as specified.

9. In an elevator, the combination of a car, a rotary shaft carried bythe car, a wheel or drum S, on said shaft, devices adapted to be forcedinto engagement with the standards or guides by the rotation of theshaft in one direction, a Wheel or drum arranged in the car,

and a connection between the wheel or drum in the car and the wheel ordrum on the shaft,

substantially as specified.

10. In an elevator, the combination of a car, a rotary shaft carried bythe car, a drum I, on said shaft, a cable wound onthe drum of the rotaryshaft, a keeper mounted on the car, and devices under the control of theattendant and adapted to normally enable the keeper to hold the cable,substantially as specified. p

In testimony whereof I'affix my signature in presence of two Witnesses.

FREDERICK T. ELLITHORPE' I Witnesses:

G. H. O. WILLIAMS, JOSIAH T. LOVEJOY.

